package com.wanxi.test;

import java.util.Objects;

public class MyObjects {
    public static void main(String[] args) {
        String aa = null;
//aa.toString();
//        System.out.println(Objects.toString(new Child()));
        ;
//        Child child =null;
//        System.out.println(Objects.toString(child, "-1"));
//        System.out.println(Objects.nonNull(child));
        if (!Objects.isNull(aa)) {
            System.out.println(aa.equals("a"));
            ;
        }
        String bb="";
        System.out.println(11 + "");

    }
}
